From: Jan Ceuleers <jan.ceuleers@computer.org>
To: Andrew Lutomirski <luto@mit.edu>
Cc: linux-kernel@vger.kernel.org, x86 <x86@kernel.org>
Subject: Re: [RFT] Please test rdtsc on various x86-64 hardware (app included)
Date: Fri, 22 Apr 2011 16:33:44 +0200 [thread overview]
Message-ID: <4DB191C8.10501@computer.org> (raw)
In-Reply-To: <BANLkTi=0gS2TSGgG15DbDPGttzCvEbEvaw@mail.gmail.com>
On 18/04/11 21:32, Andrew Lutomirski wrote:
> Hi all-
>
> I'd appreciate some help testing rdtsc's ordering wrt memory on
> various hardware.
$ ./evil-clock-test
CPU vendor : GenuineIntel
CPU model : Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz
CPU stepping : 2
TSC flags : tsc rdtscp constant_tsc nonstop_tsc
Using lfence_rdtsc because you have an Intel CPU
Will test the "lfence;rdtsc" clock.
Now test passed : margin 96 with 64336568 samples
Load3 test passed: margin 72 with 7731224 samples
Load test passed : margin 88 with 13575597 samples
Store test failed as expected: worst error 892 with 9605781 samples
Jan
next prev parent reply other threads:[~2011-04-22 14:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-18 19:32 [RFT] Please test rdtsc on various x86-64 hardware (app included) Andrew Lutomirski
2011-04-18 20:16 ` Linus Torvalds
2011-04-18 20:37 ` Ingo Molnar
2011-04-19 0:38 ` Markus Trippelsdorf
2011-04-18 20:23 ` Colin Walters
2011-04-18 20:27 ` Andrew Lutomirski
2011-04-18 20:35 ` Colin Walters
2011-04-18 20:39 ` Andrew Lutomirski
2011-04-18 22:10 ` Andi Kleen
2011-04-19 2:15 ` Andrew Lutomirski
2011-04-19 0:49 ` Mihai Donțu
2011-04-19 8:10 ` Frank Kingswood
2011-04-22 14:33 ` Jan Ceuleers [this message]
-- strict thread matches above, loose matches on Subject: below --
2011-04-19 5:06 George Spelvin
2011-04-19 6:09 ` George Spelvin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4DB191C8.10501@computer.org \
--to=jan.ceuleers@computer.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@mit.edu \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).